From 6d58d975a6d69ffafe30f51ec83cccefbecd4883 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Wed, 18 Jan 2017 00:00:48 +0000
Subject: ldso: added pe_open_image_from_addr().

---
 src/internal/pe_os.h               | 20 +++++++++
 src/ldso/pe_open_image_from_addr.c | 83 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 103 insertions(+)
 create mode 100644 src/ldso/pe_open_image_from_addr.c

(limited to 'src')

diff --git a/src/internal/pe_os.h b/src/internal/pe_os.h
index f68a462..54275e3 100644
--- a/src/internal/pe_os.h
+++ b/src/internal/pe_os.h
@@ -19,6 +19,9 @@
 #define OS_FILE_SHARE_WRITE			0x00000002
 #define OS_FILE_SHARE_DELETE			0x00000004
 
+#define OS_CURRENT_PROCESS_HANDLE		(void *)(uintptr_t)(-1)
+#define OS_CURRENT_THREAD_HANDLE		(void *)(uintptr_t)(-2)
+
 
 enum os_object_info_class {
 	OS_OBJECT_BASIC_INFORMATION	= 0,
@@ -29,6 +32,14 @@ enum os_object_info_class {
 };
 
 
+enum os_memory_info_class {
+	OS_MEMORY_BASIC_INFORMATION,
+	OS_MEMORY_WORKING_SET_LIST,
+	OS_MEMORY_SECTION_NAME,
+	OS_MEMORY_BASIC_VLM_INFORMATION
+};
+
+
 struct os_oa {
 	uint32_t		len;
 	void *			root_dir;
@@ -56,6 +67,15 @@ typedef int32_t __stdcall os_zw_query_object(
 	__out	uint32_t *		returned_length		__optional);
 
 
+typedef int32_t __stdcall os_zw_query_virtual_memory(
+	__in	void *			hprocess,
+	__in	void *			base_address,
+	__in	int			mem_info_class,
+	__out	void *			mem_info,
+	__in	uint32_t		mem_info_length,
+	__out	uint32_t *		returned_length	__optional);
+
+
 typedef int32_t __stdcall os_zw_open_file(
 	__out	void **			hfile,
 	__in	uint32_t		desired_access,
diff --git a/src/ldso/pe_open_image_from_addr.c b/src/ldso/pe_open_image_from_addr.c
new file mode 100644
index 0000000..2729a18
--- /dev/null
+++ b/src/ldso/pe_open_image_from_addr.c
@@ -0,0 +1,83 @@
+/*****************************************************************************/
+/*  pemagination: a (virtual) tour into portable bits and executable bytes   */
+/*  Copyright (C) 2013--2017  Z. Gilboa                                      */
+/*  Released under GPLv2 and GPLv3; see COPYING.PEMAGINE.                    */
+/*****************************************************************************/
+
+#include <psxtypes/psxtypes.h>
+#include <pemagine/pemagine.h>
+#include <pemagine/pe_structs.h>
+#include "pe_os.h"
+
+struct os_memory_section_name {
+	struct pe_unicode_str	section_name;
+	wchar16_t		section_name_buffer[];
+};
+
+pe_api int32_t pe_open_image_from_addr(
+	__out	void **			himage,
+	__in	void *			addr,
+	__out	uintptr_t *		buffer,
+	__in	uint32_t		buffer_size,
+	__in	uint32_t		desired_access,
+	__in	uint32_t		open_options)
+{
+	int32_t				status;
+	struct os_oa			oa;
+	struct os_iosb			iosb;
+	struct os_memory_section_name *	path;
+	uint32_t			len;
+	void *				hntdll;
+	os_zw_query_virtual_memory *	zw_query_virtual_memory;
+	os_zw_open_file *		zw_open_file;
+
+
+	/* init */
+	path = (struct os_memory_section_name *)buffer;
+	path->section_name.strlen = 0;
+	path->section_name.maxlen = (uint16_t)(buffer_size - sizeof(struct pe_unicode_str));
+	path->section_name.buffer = path->section_name_buffer;
+
+	if (!(hntdll = pe_get_ntdll_module_handle()))
+		return OS_STATUS_INTERNAL_ERROR;
+
+	if (!(zw_query_virtual_memory = (os_zw_query_virtual_memory *)pe_get_procedure_address(
+			hntdll,"ZwQueryVirtualMemory")))
+		return OS_STATUS_INTERNAL_ERROR;
+
+	if (!(zw_open_file = (os_zw_open_file *)pe_get_procedure_address(
+			hntdll,"ZwOpenFile")))
+		return OS_STATUS_INTERNAL_ERROR;
+
+	/* native path of image containing addr */
+	if ((status = zw_query_virtual_memory(
+			OS_CURRENT_PROCESS_HANDLE,
+			addr,
+			OS_MEMORY_SECTION_NAME,
+			buffer,
+			buffer_size,
+			&len)))
+		return status;
+
+	/* oa */
+	oa.len      = sizeof(struct os_oa);
+	oa.root_dir = 0;
+	oa.obj_name = &path->section_name;
+	oa.obj_attr = 0;
+	oa.sec_desc = 0;
+	oa.sec_qos  = 0;
+
+	/* default access */
+	desired_access = desired_access
+		? desired_access
+		: OS_SEC_SYNCHRONIZE | OS_FILE_READ_ATTRIBUTES | OS_FILE_READ_ACCESS;
+
+	/* open image */
+	return zw_open_file(
+		himage,
+		desired_access,
+		&oa,
+		&iosb,
+		OS_FILE_SHARE_READ | OS_FILE_SHARE_WRITE,
+		open_options | OS_FILE_NON_DIRECTORY_FILE);
+}
-- 
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